Ask a Canadian snowbird how long they can stay in the United States and the answer comes back fast and confident. Six months. A hundred and eighty two days. Half the year minus a day.
That answer is about immigration. The tax question is a different test entirely, it does not look at this year alone, and counting it wrong is how people become U.S. taxpayers without ever intending to.
We publish this in September on purpose. The decisions that set next winter’s day count are being made right now, while people are looking at flights and rental listings. By April, when somebody finally raises it, the year is already what it is.
Table of Contents
How the test actually works
The Substantial Presence Test is a formula, and it has two parts. You meet it if both are true:
You were physically present in the United States for at least 31 days during the current year, and
The weighted total of your days across three years reaches 183. The weighting is: all of the days in the current year, plus one third of the days in the previous year, plus one sixth of the days in the year before that.
Meet both, and the United States generally treats you as a resident for tax purposes, which means it wants to tax your worldwide income and know about your foreign accounts.
The look back is the part that catches people. Days from two and three winters ago are still on the scoreboard.
Why four months a year is not obviously safe
Run the arithmetic on someone who spends a consistent four months, call it 120 days, in Florida every winter.
Current year: 120 days, counted in full, so 120.
Previous year: 120 days at one third, so 40.
Year before that: 120 days at one sixth, so 20.
Total: 180.
That is under 183, but only just, and it assumes exactly 120 days every year with nothing else. Add a week for a wedding, a few days of cross border shopping, a golf trip, and a slightly longer stay one year because the weather was good, and the total goes over.
Someone doing five months, roughly 150 days a year, is at 150 plus 50 plus 25, which is 225. Comfortably over, every year, without ever approaching the six month immigration limit.
That is the whole issue in one calculation. The immigration answer and the tax answer are not the same number, and the tax answer is smaller than people think.
A day is a day
The counting rules are more literal than most people assume.
Any part of a day counts as a full day. Arriving at 11pm is a day. Leaving at 6am is a day. A weekend trip across the border is two days, or three.
There are some exempt day rules, including for certain medical conditions that prevent you leaving, and for people in specific visa categories, but they are narrower than the everyday assumption that “short trips do not count”.
People remember winters. The tax test counts days. Those are very different numbers, and the gap between them is usually made up of exactly the trips nobody writes down.
If you meet the test: the closer connection exception
Meeting the test is not automatically the end of the story, and this is the genuinely useful part.
Someone who meets the Substantial Presence Test but was in the United States for fewer than 183 days in the current year, and who maintains a tax home and a closer connection to another country, can generally claim the closer connection exception. It is claimed on Form 8840, the Closer Connection Exception Statement for Aliens.
The form asks about where your permanent home is, where your family is, where your belongings are, where you are registered to vote, where your driver’s licence is issued, where your bank accounts and business connections are. It is a facts and circumstances test, and for a genuine snowbird with a home and a life in Canada, the facts usually point clearly in the right direction.
Two things matter about it.
It has a filing deadline. It is due by the due date for filing a U.S. return, which for most people in this situation is 15 June of the following year. Filing it is a routine annual exercise for a lot of snowbirds.
And it is not available if you were in the United States 183 days or more in the current year alone. Past that line, the closer connection exception is off the table and the route is the treaty tie breaker instead, which is a heavier piece of machinery.
The treaty tie breaker
Where someone is genuinely resident in both countries under each country’s domestic rules, the Canada U.S. tax treaty has tie breaker tests applied in order: permanent home, then centre of vital interests, then habitual abode, then citizenship.
This works, and it is used every day. But it is a bigger filing and a more involved position than Form 8840, and it comes with its own reporting consequences.
The practical hierarchy is simple. Stay under the weighted threshold if you can. If you cannot, file the closer connection statement. If you cannot do that either, use the treaty and get proper advice.
What being treated as a U.S. resident actually means
It is worth being concrete, because the abstraction makes people either panic or shrug, and neither is right.
If the United States treats you as a resident for tax purposes, it taxes your worldwide income. Your Canadian pension, your CPP, your investment income, all of it becomes reportable there.
Your foreign accounts become reportable too, and the penalties attached to unfiled foreign account reports are frequently harsher than any tax that would have been owed.
Your Canadian registered accounts start interacting with U.S. rules in ways they never did before. A TFSA in particular stops being the simple thing it is for a Canadian.
And your investments may fall into the PFIC rules, which apply punishing treatment to ordinary Canadian mutual funds and ETFs held by U.S. taxpayers.
None of that is catastrophic and all of it is manageable. But it is a completely different life administratively, and nobody should walk into it by accident over a few extra weeks of sunshine.
The snowbird property question
While we are here, one adjacent thing that surprises people.
Owning U.S. real estate creates a separate exposure that has nothing to do with how many days you spend there. U.S. situs assets, which include U.S. real property, can be subject to U.S. estate tax on death even for someone who is not a U.S. resident and never was.
That is a different article, and we have written one on U.S. estate tax on U.S. situs assets held by Canadians. It is worth reading if the winter home is owned rather than rented.
Your checklist
Keep an actual written count, three years back. Arrival dates and departure dates, every trip, including the short ones. Ten minutes a year.
Run the weighted formula before you book, not after you travel. The weighting means this year’s decision affects the next two years as well.
If you are near the line, decide deliberately whether to trim the trip or file the form. Both are fine. Doing neither is not.
File Form 8840 on time if you rely on the closer connection exception, and file it every year you rely on it.
If you own U.S. property, look at the estate side separately.
And if you are anywhere close to 183 days in a single year, get cross border tax advice before the season rather than during filing season.
Where we fit
Sartorial Wealth does not prepare tax returns, and Form 8840 belongs with a cross border accountant.
What we do is make sure the plan and the portfolio are not quietly assuming a residency status the day count no longer supports. If your position changes, what you should hold changes with it, and that is the part that gets missed when the day count is treated as purely a filing question.
Being registered in both countries means we can keep managing the accounts either way, which matters more than it sounds when a residency status is in flux. Snowbirds are one of the cross border households we serve.
Common questions
How many days can a Canadian stay in the U.S. without becoming a U.S. taxpayer?
There is no single number, because the test weights three years. As a rough guide, a consistent pattern of around 120 days a year sits close to the line, and 150 days a year is over it. Run the actual formula for your own days rather than relying on a rule of thumb.
Is the 183 day rule the same as the six month immigration rule?
No. They are separate systems with separate consequences. You can be well within the immigration limit and still meet the tax test, which is the single most common misunderstanding in this area.
Do partial days count?
Yes. Any part of a day in the United States counts as a full day. Arrival and departure days both count.
What is Form 8840?
The Closer Connection Exception Statement for Aliens. It lets someone who meets the Substantial Presence Test, but was present fewer than 183 days in the current year, establish that their tax home and closer connection are in Canada. It is generally due by 15 June of the following year.
What if I was in the U.S. for more than 183 days this year?
The closer connection exception is not available. The route is the treaty tie breaker rules, which is a heavier filing and needs professional help. Do not simply hope it is fine.
Does owning a condo in Florida affect the day count?
Not directly. Ownership does not add days. But it creates a separate U.S. estate tax exposure that exists regardless of how much time you spend there, and it is worth looking at on its own.
Sources
Internal Revenue Service, Substantial Presence Test. https://www.irs.gov/individuals/international-taxpayers/substantial-presence-test
Internal Revenue Service, Closer Connection Exception to the Substantial Presence Test. https://www.irs.gov/individuals/international-taxpayers/closer-connection-exception-to-the-substantial-presence-test
Internal Revenue Service, About Form 8840, Closer Connection Exception Statement for Aliens. https://www.irs.gov/forms-pubs/about-form-8840
Convention Between Canada and the United States of America With Respect to Taxes on Income and on Capital, Article IV. Department of Finance Canada. https://www.canada.ca/en/department-finance/programs/tax-policy/tax-treaties/country/united-states-america-convention-consolidated-1980-1983-1984-1995-1997.html
Disclaimer
Sartorial Wealth Inc. is a registered Portfolio Manager in Canada (ON, QC, AB, BC, NT, NS, SK, NB, NL) and an SEC-registered investment adviser. Content is for informational purposes only and does not constitute investment, legal, tax, or insurance advice. Investing involves risk; past performance is not indicative of future results. Services are only offered where properly registered. See full disclosures at https://sartorialwealth.com.
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